Accession Number : AD0775636

Title :   Surface Self-Diffusion on an fcc Crystal: An Atomic View,

Corporate Author : ILLINOIS UNIV URBANA COORDINATED SCIENCE LAB

Personal Author(s) : Ayrault,Guy ; Ehrlich,Gert

Report Date : NOV 1973

Pagination or Media Count : 60

Abstract : Migration of individual atoms self-adsorbed on different low-index planes of a face-centered cubic metal has been studied for the first time. Diffusion coefficients and activation energies for the motion of rhodium on perfect planes of the rhodium lattice in the absence of high fields, have been derived from direct observation of atomic positions, using a field ion microscope. Correlation effects, due to interactions with other rhodium atoms, are observed even at interatomic distances greater than 7.5A. All diffusion parameters have therefore been derived from experiments with only a single atom on a plane. The results are at variance with previous measurements on similarly structured planes of tungsten; however, further observations of single atoms are needed to establish the exact role of surface structure. (Modified author abstract)

Descriptors :   *RHODIUM, *DIFFUSION, SURFACES, ATOMIC STRUCTURE, ACTIVATION ENERGY, CRYSTAL STRUCTURE

Subject Categories : Metallurgy and Metallography
      Crystallography
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE